What are these?

[RRsNano]

They’re a brown translucent color. They started off on the side of a favia frag and now they’ve spread to the glass and a rock. They’re multiplying like crazy! They start off small like the pics but grown larger almost like a fan outwards?

When I use a scrapper they scrape off easily from the glass and it’s like they dsintegrate into a powder? But the ones on the rock are like a thin plastic feel to them?

 

[lapin]

Can you post a picture with only white light?

 

[Flux Capacitor]

Are they a rusty pink color?

 

[RRsNano]

Can you post a picture with only white light?

sorry, here’s 2 pics. I guess they’re green and not brown.

 

[lapin]

This looks like ulva alage.

These spots on the glass appear to be the begining of coraline or some other sort of algae that I cant ID.